一、钨的特点及其在国民经济中的地位钨在地壳中的重量为0.007％。目前在自然界已查明的含钨矿物有二十余种,均以化合物状态存在。主要含钨矿物是黑钨矿——(Fe·Mn)[WO_4]和白钨矿——Ca[WO_4]。钨具有良好的高温硬度、强度和良好的导电。导热性。膨胀系数极小,在空气中稳定,耐腐蚀性好。它与氧的亲和力很大,在600℃空气中开始氧化,在900℃时氧化则更历害。 First, the characteristics of tungsten and its position in the national economy Tungsten weight in the crust of 0.007%. Tungsten minerals currently identified in nature have more than twenty kinds, all in the form of compounds. The main tungsten minerals are wolframite - (Fe · Mn) [WO_4] and scheelite - Ca [WO_4]. Tungsten has good high temperature hardness, strength and good electrical conductivity. Thermal conductivity. Expansion coefficient is very small, stable in the air, good corrosion resistance. It has a large affinity with oxygen, the oxidation began in the air at 600 ℃, oxidation at 900 ℃ is more harmful.